Please refer to the following (quoted from the National Tax Agency HP) for the conditions that require a final return.
1. If you receive your salary from one place and all of that salary is subject to withholding tax, the total amount of various income amounts (excluding salary income and retirement income) does not exceed 200,000 yen. surpass
2. If you receive your salary from two or more places and all of that salary is subject to withholding tax, the income amount of the salary that has not been adjusted at the end of the year and various income amounts (employment income, retirement income, etc.) ) exceeds 200,000 yen *The total amount of income deductions (excluding miscellaneous loss deductions, medical expenses deductions, donation deductions and basic deductions) from the total amount of employment income If the remaining amount after deducting is 1,500,000 yen or less, and if the total amount of various types of income (excluding salary income and retirement income) is 200,000 yen or less, no declaration is required.
In addition, please refer to this National Tax Agency HP for final tax returns (in the case of secondary income). (URL below)
https://www.nta.go.jp/taxes/shiraberu/shinkoku/kakutei/kakutei/fukugyo.htm
It is best to consult with your tax advisor or tax office.